Wrench



J. W. CALEF.

(ModeL) WRENCH.

Patented Mar.6,18 83.

l /A/ i E V. z i I. a Ej INVENTORV WITNSSES- J ATroRNBYs UNITED STAT SPATENTI OFFICE JOSEPH W. OALEF, OF NORTH EASTON, MASSACHUSETTS.

WRENCH.

SPECIFICATION formng part of Letters Patent No. 273,461, dated March 6,1883. Application filed February 3, 1883. (Moden To all whom it mayconcrn:

Be it known that I, J OSEPH W. CALEF, of North Easton, in thecounty ofBristol and State of Massachusetts, have invented certain new and usefulImprovements in Wrenches; and I do hereby declare that the following isa full, clear, and exact description of the invention, which will enable'others skilled in the art to which it appertains to make and use thesame, reference being had to the accompanyingdrawings, which form a partof' this specification, and in which- Figure 1 is a side View of myimproved wrench. Fig. 2 is an 'edge view of the same. Fig; 3 is alongitudinal section on line m x, Fig. 1. Fig. 4 is alongitudinalsection at right angles to Fig. 3, and Fig. 5 is a detail .view of thesliding jaw.

Similar letters of reference indicate corresponding parts in all thefigures. c

My invention has relation to self-adjustin'g wrenchcs and it consists inthe improved construction and combination of parts of the wrench forwhich Letters Patent No. %26,490 Were granted to me on the 13th day ofApril, 1880, as hereinafter more fully described and claimed.

In the accompanying drawings, the letter A indicates the stem or shank,which is inserted into a handle, B, and Secured therein. The upperpartof the shank forms a head, 0, which forms two cylindrically-recessedshoulders, F, ou eachside of the flattened part G of the head, from theupperedge of which project two lugs *or cars, D and E. This fiattenedpart G has a perforation, H, through which a pin or bolt, I, passes,which hinges the handle to the rigid jaw J, and the one of the lugs, E,is longer (measured from bolt I) than the lug D.

The jaw J consists 'of two plates, K, which form a recess for thereception of the fiat head G and the sliding jaw L, and a solidjawpiece, M, which connects their upper edges at one corner. i

The sliding jaw L consists of a solid jawpiece, N, and a flat groovedbolt or plate, O, the lower edge of which has two notches or recesses, Pand Q, one preferably deeper than 'the other, corresponding to the lugsD and E.

The 'sliding bolt or plate O has two parallel grooves, R, one on eachside, in which two parallel flanges, S, one on each inn'er surface ofthe plates K, fit, keeping the jaw sliding perfectly true. The lowerparte of, plates K are perforated at T for the reception of the wrench;but by coustructingthe two lngs of' unequal length (measured from thepivotal pin) and by having the one nearest the rigid jaw-piece thelongest, the'latter will serve to open the jaws quickly, and toclosethem on the first part of the throw quickly; but on the last partof the throw the smaller lug comes into operation, closing the jawsslower, with greater nicety, while a larger leverage is obtained at thesame time upon the handle by the end of the lug being a shorter distancefrom the pivotal pin, so that the jaws will close firmer around the nut,enabling the wrench to be used on proportionately-small nuts without danger of its slippin g.

Having thus'described my invention, I claim and desire to secure byLetters Patent of the United Statesy i 1. 'The combination, in a wrenchof the described class, of the sliding jaw having upon its lower edgetwo recesses, with the pivoted handle having upon its flat head twoslightly diverging lugs or ears, of unequal length from the pivotal pin,substantially as and for the purpose shown and set forth.

'2. In a wrench of 'the described class, the combination ot' the handleA B, having fiat perforated head GG,shoulders F,and slightlydiverginglugs D and E, ofunequal length' from the pivotal pin, the rigid jaw J,having solid jaw-piece M, and lower plates, K, having inside flanges, S,and perforated at their lower parts for the reception of pivotal pin I,and having rounded lower edges, U, and sliding jaw L, having solidjaw-piece N and flat sliding bolt 0, grooved at R, and having recesses Pand Q at its lower edge, as and for the purpose shown and set forth.

In testimony that I claim the foregoing as IOO

